Transformer.



L. M. SCHMIDT.

TRANSFORMER. APPLICATION FILED AUG. 7. 1906.

Witnesses:

' Inventorz 1 /5 W& 1 Louis mschmidt.

PATENTED JULY 17, 1906.

2 SHEETS SHEET 1.

2 SHEETS-SHEET 2.

PATENTED JULY 17, 1906.

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if Z6 Z4 L. M. SOHMIDTI TRANSFORMER. APPLICATION FILED AUG.7. 190s.

Witnesses: Inventor j 9/ Louis m. Schmidt,

Zi bq Wages I Dqtty.

mum; rs mm mm ASHIMSWI n c Tawll- -z'vhomrit may concern: 1

Be it knownthat I, LOUIS MxSoHurDT, a

I citizen of the UnitedStatesmesiding at Lynn,

.features of such transformers. .The various features of illustrating one form provided with supporting-feet 2. mg'3 is; formed in the curved portion of the county of. Essex, Stateof "Massachusetts, have invented certain new and useful Iniprovements in Transforniers,'of which the following is a specification.

My present invention relates to the construction of transformers, and more particularly to. the construction of small transform- ;ers, such as the so-called currentetrans' formers used in connection with'measuring instruments, &c'., as where it is desired to derive a secondary current bearing a definite relation to and usually much "smaller than a varying primary current.

' The. object of my invention is to improve and simplify the mechanical and electrical characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For

spectively, illustrating a slightly-modified form of construction.

" f In both of the forms 'of my invention illustrated the transformer proper is housed in a casin 1, preferably in the form of a cylindrica"integra1'shell made ofsuitable mate rial, such as cast-iron. Thecasing 1 may be casing, through which the annular core 4 is inserted. The core 4'm'ay be made up of annular punchings 5. After the core and any windings which may surround it are inserted in the casing a supporting member is passed through the=center of the core,w1th its ends 'rojecting through centrally-located openmgs 6, formed in the end walls of the casing.

The opening 3maybe closed when desired by means "of. an arc 'shaped slidefigwhich may be novelty which An openoFiv-EW-roRKg-i r HQ; Ab ON formed out'of sheet-iron slide'7 may be moved round agai'nstthe inner surface of the cylindricalportion of the cas, mg to permit access to' the' int eriorof the I casing.

- In the construction shownFigsfl and; the windings on the core comprise'an nner" may. consistof a compara I winding 8 ,which tively large'number of turns about the core and forms the secondary winding of the transformer. The terminals g of'this winding formed casing. core by a layer of insulation 10.-

for the purpose in the end walls of the The winding 8 is separated from the The winding may also be surrounded by'insulationd'lxare brought out through'openingslO,

The primary Winding of they transformer in" this form of my invention consists of a num.

conductors 12 are brought-out.-throughthe central aperture 6. .In the assembled transber of conductors 12, eachiof which makesone. turn about the core. The ends of the" former the ends of the conductors12arearranged to form a substantiallytubularlshell. The supporting. means;.1pr0per-f0r. the core,

- and its windings in this formof my invention consists of a bar or rod 13,-.preferably formed the core and'through located within the conductors 1 2, i The ends 1 of the bar 13 engage in sockets formed for the purpose in blocks 14, which formthe primary terminals. As shown, the portion of eac terminal adjacent the casing 1s a truncated cone.

The appropriate ends of the conductors are secured to the comcal surface'of the member I I soldering or in othersuitable manner.

1 The portion of the conductors 1'2 soldered to I of coursebar'e andfare sur-1 g \the terminalsare I p p I ,rounded by suitable insulati" n15, whichmay :be in the form' of layers of varnished. cloth, tape, or! the like. A

This cord, which is varnished gives afinis'hed of insulating materiahwhichiextends through i the openings 6, being in the form of. V

. srb fi fi tfii s between the bead 17 on eachtei'nnnaTm her and the adjacent endiofj thecasing.

appearance to the transformer and increases the mechanical strength ofthetermin'al portions. A. shell of insulating material 18,

which may be in the form-of, a hardgrubber orpaper tube,

surrounds each-set of ends of the" conductors12 and extends between the-core and the outer wall of the adjacent end of the 7 housing. The tubes 18 aresurroundedby serve to position the latter.

. I o space afterward occupied-by casing simultaneously,

ductors 12 being 15 ends of the conductors are secured to the ter mmal portions 14, after which the insulation 2 21 of conductors connected to 15 and the cords 16- are put in place. .The' outer ends'of the terminals 14 areprovided with threaded extensions 20. The terminals 12 are clamped between the outer ends of the conical portions of the terminals and clamping-nuts 22 s'ecured .upon the extensions 20.

In the form of my invention shown in Figs;

2 5 3 and 4 the core having'a primary Winding 8 0 consists of a insulating material 24 which 3 5 form of a tube the outer surface 4.5 which are threaded,

is inserted, with washers 19, in the manner described in connection with the construction shown in Figs. 1 and 2. In this form of my invention, however, the rim'ary-winding bar 23,.of con ucting material, which passes axially through forms a supporting means for the core of the transformer. The bar 23 is surrounded by may be in the core. In order to more firm y secure the parts in place, tubular members 25, which may be formed of terial, are provided, which extend between of the end walls of the casing and the core. The members 25, which have their inner ends tapered, may be forced into place to firmly clamp the parts into position. On each of the ends of the bar 23, is screwed a terminal portion 26. Between the inner ends of the terminal portion 26 and the end wall. of the casing is placed insulation, which may be in the form of disks 27, of suitable material.

Insulation 28, which may comprise several layers of varnished-cloth or the like and a layer of' cord 28, extends between each end ave-ll of the casing and a bead 29, formed on the'adjacent terminal portion 26. The ter-' 5 5 minal portions 30 of the conductors connected to the ends of the bar 23 are clamped between the outer ends of the members 24 and clan-iping-nuts' 31 screwed upon the ends of the ba1'23.

Aside from the differences pointed out the constructionishown in Figs. 1 and'2 and 3 and 4, respectively, are substantially identical. In each case the construction is extremely simple and satisfactory. The core and the winding of the transformer are protected from mechanicalin ury v rated from the end "housing by the washers in a ve mannen-and as the periphery o are pulled out occupied by.

the windings the core and extending axiall through the I wood or other suitable mabythe casing.

and W111 are sepawalls of the casing or satisfactory heiends of the core its winding are se arated from the casing by an air-space it wi be observed that the core and its winding are very effectively insulated from the 'casin At the same time the apparatus is not ulky and presents a neat appearance.

It will be obvious to all those'skilled in the art that changes may be embodiments disclosed from the s irit' of my invention, and do not wish the c aims hereinafter made to be'limited to the particular embodiments'disclosed more 171181118 made necessary'by thestatbf wi thout dgpai'ting the art.

What I claim as new,

by Letters Patent of the 1. In a transformer, a

and desire to secure United States, i's core having an open losing the core formed with osite walls, a suppo'r ,lng through openings in opt for the core extend- 2. In a transformer, acore having an openor passage formed in it, a housing fo'r' the transformer including a pair of walls between which the core is supported, each'of said'wfills being formed with an opening for the core which extends throughthe' opening or passage therein and is supported in the openings in'said housing-walls.

3. In a transformer, a'casin com risin a cylindrical portion and end we ls, said casing being formed with an. opening in itsbyliridrical portion, and an opening in each end wall, a core inserted in the casing, throu h the opening in the cylindrical portion, an a support for the core extending through said end walls, a winding on the core, and termithrough said.

nals therefor which also extend openings in the end Walls of the casing.

4. In a transformer, an annular core, an inclosing casing therefor, said casinghaving openings formed in opposite sides,- and a support for the core passing through said opening and through said core, and insulatin washers between the ends of the core and jacent casing-walls.

' 5. In a transformer, an annular core, a winding thereon, an inclosing casing therefor, said casing having openings formed in opposite Walls, and a support for the core passing through said openings and through said core, insulation between theends of the core and the adjacent casing-walls, the periphery of the core and winding thereon being separated from the adjacent portion of the "casing by space.

6. In a transformer, anannular core,.an inclosing casing therefor, cylindrical in outline, said casing having an opening formed in the core-and the opening or passage therein and supported in said casing or openings.

ands. support its curved surfacethrough which the core ma be inserted, and openings formed centra ly in its end walls, and a support for said core passing through said openings and through said core. v

7. In a transformer, a hollow core, an inclosing shell or casing, formed with an opening through which said core may be inserted, and with other openings, a support for the core extending throu h said other openings and the core, and a side located within the casing for closing the opening through which the, core is inserted.

8. In a transformer, a ring-shaped core, a cylindrical shell or casing inclosing it, said casing being formed with an o emng in its curved surface through which the core'is inserted and with openin s in its end walls through which a sup ort %or the core is passed and a curved slide or closing the first-mentioned opening located ,within the casing.

9. In a transformer, a core, a winding thereon, an inclosing shell or casing formed with an opening through which said core may be inserted, and with other openings, a support for the core passing through said other openings, said shell secured to said support, the ends of said winding passing through said other openings and being secured to said terminals.

10. In a transformer, a hollow core, windings thereon, an inclosing shell 'or casing formed with an opening through which said core maybe inserted and with other openings,

a support for said core passing through said other openings and through said hollow core,

' with soc the ends of said support projecting out of said other 0 enings, terminal members formed hets in which the ends of said support enter, the ends of said winding also extending through said openings and being secured to said terminal member.

11. In a transformer, a holloweore, wind' ings thereof, an inclosing 'shell or casing 3 formed with an opening through which said core maybe inserted and with other openings, asupport for said core passing through said openings,

and terminal members without theother 0 enings and through 'said hollow core, the en s of said support projecting out of said other opening, terminal members formed with sockets in which the ends of said support enter, the ends of said winding also extending through said openingsand being secured to said terminal member, and insulation surrounding said projecting ends of the 12. In a transformer, a hollow core, win

ings thereon, an inclosing shell or casing" formed with an openinfthrough which s core maybe inserted an with other openings, a support for saidcore passing through said other openings and through said hollow core, the ends of said sup ort projecting out of said terminal members formed with sockets in which the ends of said support enter, the ends of said windin also extending through said openings and 'eing secured, to said terminal members, and insulation surrounding each of said projecting ends of the winding, said insulation of cord. q

13. .In a transformer a hollow core, a windingabout said core, an inclosing shell or casing formed with an opening through which said core is inserted and with other openings, a sup ort passin throughsaid other openings and-t ough sai hollow core, terminal members formed with sockets into which one end of said support extends, eaoh'of said terminal members being formed with circumferentially-extending bead or shoulder, the ends of ding passing through said other openings and being secured to said terminal memcomprising a layer bers, and insulation surrounding each of the projecting ends of the winding comprising a ayer of cord which extends between'the-wall' of the casing and the shoulder on the adjacent terminal. a

In witness whereof I have hereunto'set my 

